Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa
Introduction: Cities located in lower income countries are global flood risk hotspots. Assessment and management of these risks forms a key part of global climate adaptation efforts. City scale flood risk assessments necessitate flood hazard information, which is challenging to obtain in these local...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-02-01
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| Series: | Frontiers in Environmental Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenvs.2024.1330295/full |
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| author | Andrew B. Carr Mark A. Trigg Alemseged Tamiru Haile Mark V. Bernhofen Abel Negussie Alemu Abel Negussie Alemu Tilaye Worku Bekele Tilaye Worku Bekele Claire L. Walsh |
| author_facet | Andrew B. Carr Mark A. Trigg Alemseged Tamiru Haile Mark V. Bernhofen Abel Negussie Alemu Abel Negussie Alemu Tilaye Worku Bekele Tilaye Worku Bekele Claire L. Walsh |
| author_sort | Andrew B. Carr |
| collection | DOAJ |
| description | Introduction: Cities located in lower income countries are global flood risk hotspots. Assessment and management of these risks forms a key part of global climate adaptation efforts. City scale flood risk assessments necessitate flood hazard information, which is challenging to obtain in these localities because of data quality/scarcity issues, and the complex multi-source nature of urban flood dynamics. A growing array of global datasets provide an attractive means of closing these data gaps, but their suitability for this context remains relatively unknown.Methods: Here, we test the use of relevant global terrain, rainfall, and flood hazard data products in a flood hazard and exposure assessment framework covering Addis Ababa, Ethiopia. To conduct the tests, we first developed a city scale rain-on-grid hydrodynamic flood model based on local data and used the model results to identify buildings exposed to flooding. We then observed how the results of this flood exposure assessment changed when each of the global datasets are used in turn to drive the hydrodynamic model in place of its local counterpart.Results and discussion: Results are evaluated in terms of both the total number of exposed buildings, and the spatial distribution of exposure across Addis Ababa. Our results show that of the datasets tested, the FABDEM global terrain and the PXR global rainfall data products provide the most promise for use at the city scale in lower income countries. |
| first_indexed | 2024-03-08T03:23:51Z |
| format | Article |
| id | doaj.art-cda392f9a6ca4ebc8b6573623dfd61b8 |
| institution | Directory Open Access Journal |
| issn | 2296-665X |
| language | English |
| last_indexed | 2024-03-08T03:23:51Z |
| publishDate | 2024-02-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Environmental Science |
| spelling | doaj.art-cda392f9a6ca4ebc8b6573623dfd61b82024-02-12T04:45:42ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2024-02-011210.3389/fenvs.2024.13302951330295Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis AbabaAndrew B. Carr0Mark A. Trigg1Alemseged Tamiru Haile2Mark V. Bernhofen3Abel Negussie Alemu4Abel Negussie Alemu5Tilaye Worku Bekele6Tilaye Worku Bekele7Claire L. Walsh8School of Civil Engineering, University of Leeds, Leeds, United KingdomSchool of Civil Engineering, University of Leeds, Leeds, United KingdomInternational Water Management Institute, Addis Ababa, EthiopiaSmith School of Enterprise and the Environment, University of Oxford, Oxford, United KingdomInternational Water Management Institute, Addis Ababa, EthiopiaWater Technology Institute, Arba Minch University, Arba Minch, EthiopiaInternational Water Management Institute, Addis Ababa, EthiopiaWater Technology Institute, Arba Minch University, Arba Minch, EthiopiaSchool of Engineering, Newcastle University, Newcastle upon Tyne, United KingdomIntroduction: Cities located in lower income countries are global flood risk hotspots. Assessment and management of these risks forms a key part of global climate adaptation efforts. City scale flood risk assessments necessitate flood hazard information, which is challenging to obtain in these localities because of data quality/scarcity issues, and the complex multi-source nature of urban flood dynamics. A growing array of global datasets provide an attractive means of closing these data gaps, but their suitability for this context remains relatively unknown.Methods: Here, we test the use of relevant global terrain, rainfall, and flood hazard data products in a flood hazard and exposure assessment framework covering Addis Ababa, Ethiopia. To conduct the tests, we first developed a city scale rain-on-grid hydrodynamic flood model based on local data and used the model results to identify buildings exposed to flooding. We then observed how the results of this flood exposure assessment changed when each of the global datasets are used in turn to drive the hydrodynamic model in place of its local counterpart.Results and discussion: Results are evaluated in terms of both the total number of exposed buildings, and the spatial distribution of exposure across Addis Ababa. Our results show that of the datasets tested, the FABDEM global terrain and the PXR global rainfall data products provide the most promise for use at the city scale in lower income countries.https://www.frontiersin.org/articles/10.3389/fenvs.2024.1330295/fullfloodscitiesglobal datasetsrain-on-grid modelhydraulic modelrisk |
| spellingShingle | Andrew B. Carr Mark A. Trigg Alemseged Tamiru Haile Mark V. Bernhofen Abel Negussie Alemu Abel Negussie Alemu Tilaye Worku Bekele Tilaye Worku Bekele Claire L. Walsh Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa Frontiers in Environmental Science floods cities global datasets rain-on-grid model hydraulic model risk |
| title | Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa |
| title_full | Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa |
| title_fullStr | Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa |
| title_full_unstemmed | Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa |
| title_short | Using global datasets to estimate flood exposure at the city scale: an evaluation in Addis Ababa |
| title_sort | using global datasets to estimate flood exposure at the city scale an evaluation in addis ababa |
| topic | floods cities global datasets rain-on-grid model hydraulic model risk |
| url | https://www.frontiersin.org/articles/10.3389/fenvs.2024.1330295/full |
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